git.sesse.net Git - vlc/blob - src/audio_decoder/audio_math.c

   1 /*****************************************************************************
   2  * audio_math.c: Inverse Discrete Cosine Transform and Pulse Code Modulation
   3  * (c)1999 VideoLAN
   4  *****************************************************************************/
   5 /*****************************************************************************
   6  * Preamble
   7  *****************************************************************************/
   8 #include <unistd.h>
   9 #include <stdio.h>                                            /* "intf_msg.h" */
  10 #include <stdlib.h>                                       /* malloc(), free() */
  11 #include <netinet/in.h>                                            /* ntohl() */
  12 #include <sys/soundcard.h>                                /* "audio_output.h" */
  13 #include <sys/uio.h>
  14
  15 #include "config.h"
  16 #include "common.h"
  17 #include "mtime.h"
  18 #include "vlc_thread.h"
  19 #include "debug.h"
  20
  21 #include "intf_msg.h"                         /* intf_DbgMsg(), intf_ErrMsg() */
  22
  23 #include "input.h"
  24 #include "input_netlist.h"
  25 #include "decoder_fifo.h"
  26
  27 #include "audio_output.h"
  28
  29 #include "audio_constants.h"
  30 #include "audio_decoder.h"
  31 #include "audio_math.h"
  32
  33 /*****************************************************************************
  34  * DCT32: Fast 32 points Discrete Cosine Transform
  35  *****************************************************************************
  36  * 289 additions and multiplications
  37  * F(u)=alpha(u)*SUM(x=0, x<N) f(x)*cos((2x+1)u*pi/2N)
  38  * where alpha(u) = sqrt(2)/N if u=0, 2/N otherwise.
  39  * See fastdct.ps, and fast.tar.gz for a (Fortran :) implementation.
  40  *****************************************************************************/
  41
  42 void DCT32(float *x, adec_bank_t *b)
  43 {
  44     /* cosine coefficients */
  45     static const float c2  =  .70710678118655;
  46     static const float c3  =  .54119610014620;
  47     static const float c4  = -1.3065629648764;
  48     static const float c5  =  .50979557910416;
  49     static const float c6  =  .89997622313642;
  50     static const float c7  = -2.5629154477415;
  51     static const float c8  = -.60134488693505;
  52     static const float c9  =  .50241928618816;
  53     static const float c10 =  .56694403481636;
  54     static const float c11 =  .78815462345125;
  55     static const float c12 =  1.7224470982383;
  56     static const float c13 = -5.1011486186892;
  57     static const float c14 = -1.0606776859903;
  58     static const float c15 = -.64682178335999;
  59     static const float c16 = -.52249861493969;
  60     static const float c17 =  .50060299823520;
  61     static const float c18 =  .51544730992262;
  62     static const float c19 =  .55310389603444;
  63     static const float c20 =  .62250412303566;
  64     static const float c21 =  .74453627100230;
  65     static const float c22 =  .97256823786196;
  66     static const float c23 =  1.4841646163142;
  67     static const float c24 =  3.4076084184687;
  68     static const float c25 = -10.190008123548;
  69     static const float c26 = -2.0577810099534;
  70     static const float c27 = -1.1694399334329;
  71     static const float c28 = -.83934964541553;
  72     static const float c29 = -.67480834145501;
  73     static const float c30 = -.58293496820613;
  74     static const float c31 = -.53104259108978;
  75     static const float c32 = -.50547095989754;
  76
  77     /* temporary variables */
  78     float  t1  , t2  , t3  , t4  , t5  , t6  , t7  , t8  ,
  79            t9  , t10 , t11 , t12 , t13 , t14 , t15 , t16 ,
  80            t17 , t18 , t19 , t20 , t21 , t22 , t23 , t24 ,
  81            t25 , t26 , t27 , t28 , t29 , t30 , t31 , t32 ,
  82            tt1 , tt2 , tt3 , tt4 , tt5 , tt6 , tt7 , tt8 ,
  83            tt9 , tt10, tt11, tt12, tt13, tt14, tt15, tt16,
  84            tt17, tt18, tt19, tt20, tt21, tt22, tt23, tt24,
  85            tt25, tt26, tt27, tt28, tt29, tt30, tt31, tt32, *y;
  86
  87     /* We unrolled the loops */
  88     /* Odd-even ordering is integrated before the 1st stage */
  89     t17 = c17 * (x[0] - x[31]);
  90     t1  = x[0] + x[31];
  91     t18 = c18 * (x[2] - x[29]);
  92     t2  = x[2] + x[29];
  93     t19 = c19 * (x[4] - x[27]);
  94     t3  = x[4] + x[27];
  95     t20 = c20 * (x[6] - x[25]);
  96     t4  = x[6] + x[25];
  97     t21 = c21 * (x[8] - x[23]);
  98     t5  = x[8] + x[23];
  99     t22 = c22 * (x[10] - x[21]);
 100     t6  = x[10] + x[21];
 101     t23 = c23 * (x[12] - x[19]);
 102     t7  = x[12] + x[19];
 103     t24 = c24 * (x[14] - x[17]);
 104     t8  = x[14] + x[17];
 105     t25 = c25 * (x[16] - x[15]);
 106     t9  = x[16] + x[15];
 107     t26 = c26 * (x[18] - x[13]);
 108     t10 = x[18] + x[13];
 109     t27 = c27 * (x[20] - x[11]);
 110     t11 = x[20] + x[11];
 111     t28 = c28 * (x[22] - x[9]);
 112     t12 = x[22] + x[9];
 113     t29 = c29 * (x[24] - x[7]);
 114     t13 = x[24] + x[7];
 115     t30 = c30 * (x[26] - x[5]);
 116     t14 = x[26] + x[5];
 117     t31 = c31 * (x[28] - x[3]);
 118     t15 = x[28] + x[3];
 119     t32 = c32 * (x[30] - x[1]);
 120     t16 = x[30] + x[1];
 121     /* 2nd stage */
 122     tt9  = c9  * (t1  - t9 );
 123     tt1  = t1  + t9;
 124     tt10 = c10 * (t2  - t10);
 125     tt2  = t2  + t10;
 126     tt11 = c11 * (t3  - t11);
 127     tt3  = t3  + t11;
 128     tt12 = c12 * (t4  - t12);
 129     tt4  = t4  + t12;
 130     tt13 = c13 * (t5  - t13);
 131     tt5  = t5  + t13;
 132     tt14 = c14 * (t6  - t14);
 133     tt6  = t6  + t14;
 134     tt15 = c15 * (t7  - t15);
 135     tt7  = t7  + t15;
 136     tt16 = c16 * (t8  - t16);
 137     tt8  = t8  + t16;
 138     tt25 = c9  * (t17 - t25);
 139     tt17 = t17 + t25;
 140     tt26 = c10 * (t18 - t26);
 141     tt18 = t18 + t26;
 142     tt27 = c11 * (t19 - t27);
 143     tt19 = t19 + t27;
 144     tt28 = c12 * (t20 - t28);
 145     tt20 = t20 + t28;
 146     tt29 = c13 * (t21 - t29);
 147     tt21 = t21 + t29;
 148     tt30 = c14 * (t22 - t30);
 149     tt22 = t22 + t30;
 150     tt31 = c15 * (t23 - t31);
 151     tt23 = t23 + t31;
 152     tt32 = c16 * (t24 - t32);
 153     tt24 = t24 + t32;
 154     /* 3rd stage */
 155     t5  = c5 * (tt1  - tt5 );
 156     t1  = tt1  + tt5;
 157     t6  = c6 * (tt2  - tt6 );
 158     t2  = tt2  + tt6;
 159     t7  = c7 * (tt3  - tt7 );
 160     t3  = tt3  + tt7;
 161     t8  = c8 * (tt4  - tt8 );
 162     t4  = tt4  + tt8;
 163     t13 = c5 * (tt9  - tt13);
 164     t9  = tt9  + tt13;
 165     t14 = c6 * (tt10 - tt14);
 166     t10 = tt10 + tt14;
 167     t15 = c7 * (tt11 - tt15);
 168     t11 = tt11 + tt15;
 169     t16 = c8 * (tt12 - tt16);
 170     t12 = tt12 + tt16;
 171     t21 = c5 * (tt17 - tt21);
 172     t17 = tt17 + tt21;
 173     t22 = c6 * (tt18 - tt22);
 174     t18 = tt18 + tt22;
 175     t23 = c7 * (tt19 - tt23);
 176     t19 = tt19 + tt23;
 177     t24 = c8 * (tt20 - tt24);
 178     t20 = tt20 + tt24;
 179     t29 = c5 * (tt25 - tt29);
 180     t25 = tt25 + tt29;
 181     t30 = c6 * (tt26 - tt30);
 182     t26 = tt26 + tt30;
 183     t31 = c7 * (tt27 - tt31);
 184     t27 = tt27 + tt31;
 185     t32 = c8 * (tt28 - tt32);
 186     t28 = tt28 + tt32;
 187     /* 4th stage */
 188     tt3  = c3 * (t1  - t3 );
 189     tt1  = t1  + t3;
 190     tt4  = c4 * (t2  - t4 );
 191     tt2  = t2  + t4;
 192     tt7  = c3 * (t5  - t7 );
 193     tt5  = t5  + t7;
 194     tt8  = c4 * (t6  - t8 );
 195     tt6  = t6  + t8;
 196     tt11 = c3 * (t9  - t11);
 197     tt9  = t9  + t11;
 198     tt12 = c4 * (t10 - t12);
 199     tt10 = t10 + t12;
 200     tt15 = c3 * (t13 - t15);
 201     tt13 = t13 + t15;
 202     tt16 = c4 * (t14 - t16);
 203     tt14 = t14 + t16;
 204     tt19 = c3 * (t17 - t19);
 205     tt17 = t17 + t19;
 206     tt20 = c4 * (t18 - t20);
 207     tt18 = t18 + t20;
 208     tt23 = c3 * (t21 - t23);
 209     tt21 = t21 + t23;
 210     tt24 = c4 * (t22 - t24);
 211     tt22 = t22 + t24;
 212     tt27 = c3 * (t25 - t27);
 213     tt25 = t25 + t27;
 214     tt28 = c4 * (t26 - t28);
 215     tt26 = t26 + t28;
 216     tt31 = c3 * (t29 - t31);
 217     tt29 = t29 + t31;
 218     tt32 = c4 * (t30 - t32);
 219     tt30 = t30 + t32;
 220     /* Bit-reverse ordering is integrated after the 5th stage */
 221     /* Begin to split the result of the DCT (t1 to t32) in the filter bank */
 222     x = b->actual + b->pos;
 223     y = (b->actual == b->v1 ? b->v2 : b->v1) + b->pos;
 224     x[0] = -(y[0] = c2 * (tt1  - tt2 )); /* t17 */
 225     x[256] = 0; y[256] = tt1  + tt2; /* t1  */
 226     t25 = c2 * (tt3  - tt4 );
 227     t9  = tt3  + tt4;
 228     t21 = c2 * (tt5  - tt6 );
 229     t5  = tt5  + tt6;
 230     t29 = c2 * (tt7  - tt8 );
 231     t13 = tt7  + tt8;
 232     t19 = c2 * (tt9  - tt10);
 233     t3  = tt9  + tt10;
 234     t27 = c2 * (tt11 - tt12);
 235     t11 = tt11 + tt12;
 236     t23 = c2 * (tt13 - tt14);
 237     t7  = tt13 + tt14;
 238     t31 = c2 * (tt15 - tt16);
 239     t15 = tt15 + tt16;
 240     t18 = c2 * (tt17 - tt18);
 241     t2  = tt17 + tt18;
 242     t26 = c2 * (tt19 - tt20);
 243     t10 = tt19 + tt20;
 244     t22 = c2 * (tt21 - tt22);
 245     t6  = tt21 + tt22;
 246     t30 = c2 * (tt23 - tt24);
 247     t14 = tt23 + tt24;
 248     t20 = c2 * (tt25 - tt26);
 249     t4  = tt25 + tt26;
 250     t28 = c2 * (tt27 - tt28);
 251     t12 = tt27 + tt28;
 252     t24 = c2 * (tt29 - tt30);
 253     t8  = tt29 + tt30;
 254     t32 = c2 * (tt31 - tt32);
 255     t16 = tt31 + tt32;
 256     /* Do the sums */
 257     /* Keep on splitting the result */
 258     y[384] = y[128] = t9 - (x[128] = -(x[384] = t25)); /* t25, t9  */
 259     t10 += t26;
 260     t11 += t27;
 261     t12 += t28;
 262     t13 += t29;
 263     t14 += t30;
 264     t15 += t31;
 265     t16 += t32;
 266     y[320] = y[192] = t5 + t13; /* t5  */
 267     y[448] = y[64] = t13 + t21; /* t13 */
 268     x[64] = -(x[448] = t21 - (x[192] = -(x[320] = t29))); /* t29, t21 */
 269     t6  += t14;
 270     t14 += t22;
 271     t22 += t30;
 272     t7  += t15;
 273     t15 += t23;
 274     t23 += t31;
 275     t8  += t16;
 276     t16 += t24;
 277     t24 += t32;
 278     y[288] = y[224] = t3 + t7; /* t3  */
 279     y[352] = y[160] = t7 + t11; /* t7  */
 280     y[416] = y[96] = t11 + t15; /* t11 */
 281     y[480] = y[32] = t15 + t19; /* t15 */
 282     x[32] = -(x[480] = t19 + t23); /* t19 */
 283     x[96] = -(x[416] = t23 + t27); /* t23 */
 284     x[160] = -(x[352] = t27 - (x[224] = -(x[288] = t31))); /* t31, t27 */
 285     t4  += t8 ;
 286     t8  += t12;
 287     t12 += t16;
 288     t16 += t20;
 289     t20 += t24;
 290     t24 += t28;
 291     t28 += t32;
 292     y[272] = y[240] = t2 + t4; /* t2  */
 293     y[304] = y[208] = t4 + t6; /* t4  */
 294     y[336] = y[176] = t6 + t8; /* t6  */
 295     y[368] = y[144] = t8 + t10; /* t8  */
 296     y[400] = y[112] = t10 + t12; /* t10 */
 297     y[432] = y[80] = t12 + t14; /* t12 */
 298     y[464] = y[48] = t14 + t16; /* t14 */
 299     y[496] = y[16] = t16 + t18; /* t16 */
 300     x[16] = -(x[496] = t18 + t20); /* t18 */
 301     x[48] = -(x[464] = t20 + t22); /* t20 */
 302     x[80] = -(x[432] = t22 + t24); /* t22 */
 303     x[112] = -(x[400] = t24 + t26); /* t24 */
 304     x[144] = -(x[368] = t26 + t28); /* t26 */
 305     x[176] = -(x[336] = t28 + t30); /* t28 */
 306     x[208] = -(x[304] = t30 - (x[240] = -(x[272] = t32))); /* t32, t30 */
 307     /* Note that to be really complete, the DCT should multiply t1 by sqrt(2)/N
 308        and t2 to t32 by 2/N, and would take 321 additions and multiplications.
 309        But that's unuseful in this application. */
 310 }
 311
 312
 313 /*****************************************************************************
 314  * PCM: Pulse Code Modulation
 315  *****************************************************************************
 316  * Compute 32 PCM samples with a convolution product
 317  *****************************************************************************/
 318
 319 void PCM(adec_bank_t *b, s16 **pcm, int jump)
 320 {
 321     /* scale factor */
 322 #define F 32768
 323     /* These values are not in the same order as in Annex 3-B.3 of the ISO/IEC
 324        DIS 11172-3 */
 325     static const float c[512] = {
 326         0.000000000 * F, -0.000442505 * F,  0.003250122 * F, -0.007003784 * F,
 327         0.031082153 * F, -0.078628540 * F,  0.100311279 * F, -0.572036743 * F,
 328         1.144989014 * F,  0.572036743 * F,  0.100311279 * F,  0.078628540 * F,
 329         0.031082153 * F,  0.007003784 * F,  0.003250122 * F,  0.000442505 * F,
 330        -0.000015259 * F, -0.000473022 * F,  0.003326416 * F, -0.007919312 * F,
 331         0.030517578 * F, -0.084182739 * F,  0.090927124 * F, -0.600219727 * F,
 332         1.144287109 * F,  0.543823242 * F,  0.108856201 * F,  0.073059082 * F,
 333         0.031478882 * F,  0.006118774 * F,  0.003173828 * F,  0.000396729 * F,
 334        -0.000015259 * F, -0.000534058 * F,  0.003387451 * F, -0.008865356 * F,
 335         0.029785156 * F, -0.089706421 * F,  0.080688477 * F, -0.628295898 * F,
 336         1.142211914 * F,  0.515609741 * F,  0.116577148 * F,  0.067520142 * F,
 337         0.031738281 * F,  0.005294800 * F,  0.003082275 * F,  0.000366211 * F,
 338        -0.000015259 * F, -0.000579834 * F,  0.003433228 * F, -0.009841919 * F,
 339         0.028884888 * F, -0.095169067 * F,  0.069595337 * F, -0.656219482 * F,
 340         1.138763428 * F,  0.487472534 * F,  0.123474121 * F,  0.061996460 * F,
 341         0.031845093 * F,  0.004486084 * F,  0.002990723 * F,  0.000320435 * F,
 342        -0.000015259 * F, -0.000625610 * F,  0.003463745 * F, -0.010848999 * F,
 343         0.027801514 * F, -0.100540161 * F,  0.057617188 * F, -0.683914185 * F,
 344         1.133926392 * F,  0.459472656 * F,  0.129577637 * F,  0.056533813 * F,
 345         0.031814575 * F,  0.003723145 * F,  0.002899170 * F,  0.000289917 * F,
 346        -0.000015259 * F, -0.000686646 * F,  0.003479004 * F, -0.011886597 * F,
 347         0.026535034 * F, -0.105819702 * F,  0.044784546 * F, -0.711318970 * F,
 348         1.127746582 * F,  0.431655884 * F,  0.134887695 * F,  0.051132202 * F,
 349         0.031661987 * F,  0.003005981 * F,  0.002792358 * F,  0.000259399 * F,
 350        -0.000015259 * F, -0.000747681 * F,  0.003479004 * F, -0.012939453 * F,
 351         0.025085449 * F, -0.110946655 * F,  0.031082153 * F, -0.738372803 * F,
 352         1.120223999 * F,  0.404083252 * F,  0.139450073 * F,  0.045837402 * F,
 353         0.031387329 * F,  0.002334595 * F,  0.002685547 * F,  0.000244141 * F,
 354        -0.000030518 * F, -0.000808716 * F,  0.003463745 * F, -0.014022827 * F,
 355         0.023422241 * F, -0.115921021 * F,  0.016510010 * F, -0.765029907 * F,
 356         1.111373901 * F,  0.376800537 * F,  0.143264771 * F,  0.040634155 * F,
 357         0.031005859 * F,  0.001693726 * F,  0.002578735 * F,  0.000213623 * F,
 358        -0.000030518 * F, -0.000885010 * F,  0.003417969 * F, -0.015121460 * F,
 359         0.021575928 * F, -0.120697021 * F,  0.001068115 * F, -0.791213989 * F,
 360         1.101211548 * F,  0.349868774 * F,  0.146362305 * F,  0.035552979 * F,
 361         0.030532837 * F,  0.001098633 * F,  0.002456665 * F,  0.000198364 * F,
 362        -0.000030518 * F, -0.000961304 * F,  0.003372192 * F, -0.016235352 * F,
 363         0.019531250 * F, -0.125259399 * F, -0.015228271 * F, -0.816864014 * F,
 364         1.089782715 * F,  0.323318481 * F,  0.148773193 * F,  0.030609131 * F,
 365         0.029937744 * F,  0.000549316 * F,  0.002349854 * F,  0.000167847 * F,
 366        -0.000030518 * F, -0.001037598 * F,  0.003280640 * F, -0.017349243 * F,
 367         0.017257690 * F, -0.129562378 * F, -0.032379150 * F, -0.841949463 * F,
 368         1.077117920 * F,  0.297210693 * F,  0.150497437 * F,  0.025817871 * F,
 369         0.029281616 * F,  0.000030518 * F,  0.002243042 * F,  0.000152588 * F,
 370        -0.000045776 * F, -0.001113892 * F,  0.003173828 * F, -0.018463135 * F,
 371         0.014801025 * F, -0.133590698 * F, -0.050354004 * F, -0.866363525 * F,
 372         1.063217163 * F,  0.271591187 * F,  0.151596069 * F,  0.021179199 * F,
 373         0.028533936 * F, -0.000442505 * F,  0.002120972 * F,  0.000137329 * F,
 374        -0.000045776 * F, -0.001205444 * F,  0.003051758 * F, -0.019577026 * F,
 375         0.012115479 * F, -0.137298584 * F, -0.069168091 * F, -0.890090942 * F,
 376         1.048156738 * F,  0.246505737 * F,  0.152069092 * F,  0.016708374 * F,
 377         0.027725220 * F, -0.000869751 * F,  0.002014160 * F,  0.000122070 * F,
 378        -0.000061035 * F, -0.001296997 * F,  0.002883911 * F, -0.020690918 * F,
 379         0.009231567 * F, -0.140670776 * F, -0.088775635 * F, -0.913055420 * F,
 380         1.031936646 * F,  0.221984863 * F,  0.151962280 * F,  0.012420654 * F,
 381         0.026840210 * F, -0.001266479 * F,  0.001907349 * F,  0.000106812 * F,
 382        -0.000061035 * F, -0.001388550 * F,  0.002700806 * F, -0.021789551 * F,
 383         0.006134033 * F, -0.143676758 * F, -0.109161377 * F, -0.935195923 * F,
 384         1.014617920 * F,  0.198059082 * F,  0.151306152 * F,  0.008316040 * F,
 385         0.025909424 * F, -0.001617432 * F,  0.001785278 * F,  0.000106812 * F,
 386        -0.000076294 * F, -0.001480103 * F,  0.002487183 * F, -0.022857666 * F,
 387         0.002822876 * F, -0.146255493 * F, -0.130310059 * F, -0.956481934 * F,
 388         0.996246338 * F,  0.174789429 * F,  0.150115967 * F,  0.004394531 * F,
 389         0.024932861 * F, -0.001937866 * F,  0.001693726 * F,  0.000091553 * F,
 390        -0.000076294 * F, -0.001586914 * F,  0.002227783 * F, -0.023910522 * F,
 391        -0.000686646 * F, -0.148422241 * F, -0.152206421 * F, -0.976852417 * F,
 392         0.976852417 * F,  0.152206421 * F,  0.148422241 * F,  0.000686646 * F,
 393         0.023910522 * F, -0.002227783 * F,  0.001586914 * F,  0.000076294 * F,
 394        -0.000091553 * F, -0.001693726 * F,  0.001937866 * F, -0.024932861 * F,
 395        -0.004394531 * F, -0.150115967 * F, -0.174789429 * F, -0.996246338 * F,
 396         0.956481934 * F,  0.130310059 * F,  0.146255493 * F, -0.002822876 * F,
 397         0.022857666 * F, -0.002487183 * F,  0.001480103 * F,  0.000076294 * F,
 398        -0.000106812 * F, -0.001785278 * F,  0.001617432 * F, -0.025909424 * F,
 399        -0.008316040 * F, -0.151306152 * F, -0.198059082 * F, -1.014617920 * F,
 400         0.935195923 * F,  0.109161377 * F,  0.143676758 * F, -0.006134033 * F,
 401         0.021789551 * F, -0.002700806 * F,  0.001388550 * F,  0.000061035 * F,
 402        -0.000106812 * F, -0.001907349 * F,  0.001266479 * F, -0.026840210 * F,
 403        -0.012420654 * F, -0.151962280 * F, -0.221984863 * F, -1.031936646 * F,
 404         0.913055420 * F,  0.088775635 * F,  0.140670776 * F, -0.009231567 * F,
 405         0.020690918 * F, -0.002883911 * F,  0.001296997 * F,  0.000061035 * F,
 406        -0.000122070 * F, -0.002014160 * F,  0.000869751 * F, -0.027725220 * F,
 407        -0.016708374 * F, -0.152069092 * F, -0.246505737 * F, -1.048156738 * F,
 408         0.890090942 * F,  0.069168091 * F,  0.137298584 * F, -0.012115479 * F,
 409         0.019577026 * F, -0.003051758 * F,  0.001205444 * F,  0.000045776 * F,
 410        -0.000137329 * F, -0.002120972 * F,  0.000442505 * F, -0.028533936 * F,
 411        -0.021179199 * F, -0.151596069 * F, -0.271591187 * F, -1.063217163 * F,
 412         0.866363525 * F,  0.050354004 * F,  0.133590698 * F, -0.014801025 * F,
 413         0.018463135 * F, -0.003173828 * F,  0.001113892 * F,  0.000045776 * F,
 414        -0.000152588 * F, -0.002243042 * F, -0.000030518 * F, -0.029281616 * F,
 415        -0.025817871 * F, -0.150497437 * F, -0.297210693 * F, -1.077117920 * F,
 416         0.841949463 * F,  0.032379150 * F,  0.129562378 * F, -0.017257690 * F,
 417         0.017349243 * F, -0.003280640 * F,  0.001037598 * F,  0.000030518 * F,
 418        -0.000167847 * F, -0.002349854 * F, -0.000549316 * F, -0.029937744 * F,
 419        -0.030609131 * F, -0.148773193 * F, -0.323318481 * F, -1.089782715 * F,
 420         0.816864014 * F,  0.015228271 * F,  0.125259399 * F, -0.019531250 * F,
 421         0.016235352 * F, -0.003372192 * F,  0.000961304 * F,  0.000030518 * F,
 422        -0.000198364 * F, -0.002456665 * F, -0.001098633 * F, -0.030532837 * F,
 423        -0.035552979 * F, -0.146362305 * F, -0.349868774 * F, -1.101211548 * F,
 424         0.791213989 * F, -0.001068115 * F,  0.120697021 * F, -0.021575928 * F,
 425         0.015121460 * F, -0.003417969 * F,  0.000885010 * F,  0.000030518 * F,
 426        -0.000213623 * F, -0.002578735 * F, -0.001693726 * F, -0.031005859 * F,
 427        -0.040634155 * F, -0.143264771 * F, -0.376800537 * F, -1.111373901 * F,
 428         0.765029907 * F, -0.016510010 * F,  0.115921021 * F, -0.023422241 * F,
 429         0.014022827 * F, -0.003463745 * F,  0.000808716 * F,  0.000030518 * F,
 430        -0.000244141 * F, -0.002685547 * F, -0.002334595 * F, -0.031387329 * F,
 431        -0.045837402 * F, -0.139450073 * F, -0.404083252 * F, -1.120223999 * F,
 432         0.738372803 * F, -0.031082153 * F,  0.110946655 * F, -0.025085449 * F,
 433         0.012939453 * F, -0.003479004 * F,  0.000747681 * F,  0.000015259 * F,
 434        -0.000259399 * F, -0.002792358 * F, -0.003005981 * F, -0.031661987 * F,
 435        -0.051132202 * F, -0.134887695 * F, -0.431655884 * F, -1.127746582 * F,
 436         0.711318970 * F, -0.044784546 * F,  0.105819702 * F, -0.026535034 * F,
 437         0.011886597 * F, -0.003479004 * F,  0.000686646 * F,  0.000015259 * F,
 438        -0.000289917 * F, -0.002899170 * F, -0.003723145 * F, -0.031814575 * F,
 439        -0.056533813 * F, -0.129577637 * F, -0.459472656 * F, -1.133926392 * F,
 440         0.683914185 * F, -0.057617188 * F,  0.100540161 * F, -0.027801514 * F,
 441         0.010848999 * F, -0.003463745 * F,  0.000625610 * F,  0.000015259 * F,
 442        -0.000320435 * F, -0.002990723 * F, -0.004486084 * F, -0.031845093 * F,
 443        -0.061996460 * F, -0.123474121 * F, -0.487472534 * F, -1.138763428 * F,
 444         0.656219482 * F, -0.069595337 * F,  0.095169067 * F, -0.028884888 * F,
 445         0.009841919 * F, -0.003433228 * F,  0.000579834 * F,  0.000015259 * F,
 446        -0.000366211 * F, -0.003082275 * F, -0.005294800 * F, -0.031738281 * F,
 447        -0.067520142 * F, -0.116577148 * F, -0.515609741 * F, -1.142211914 * F,
 448         0.628295898 * F, -0.080688477 * F,  0.089706421 * F, -0.029785156 * F,
 449         0.008865356 * F, -0.003387451 * F,  0.000534058 * F,  0.000015259 * F,
 450        -0.000396729 * F, -0.003173828 * F, -0.006118774 * F, -0.031478882 * F,
 451        -0.073059082 * F, -0.108856201 * F, -0.543823242 * F, -1.144287109 * F,
 452         0.600219727 * F, -0.090927124 * F,  0.084182739 * F, -0.030517578 * F,
 453         0.007919312 * F, -0.003326416 * F,  0.000473022 * F,  0.000015259 * F
 454         };
 455 #undef F
 456     int i;
 457     float tmp, *v;
 458     const float *f;
 459
 460     f = c;
 461
 462     switch(b->pos) {
 463         case 0:
 464             v = b->actual;
 465             for(i=0; i<32; i++) {
 466                 tmp = *f++ * *v;
 467                 v += 15;
 468                 tmp += *f++ * *v--;
 469                 tmp += *f++ * *v--;
 470                 tmp += *f++ * *v--;
 471                 tmp += *f++ * *v--;
 472                 tmp += *f++ * *v--;
 473                 tmp += *f++ * *v--;
 474                 tmp += *f++ * *v--;
 475                 tmp += *f++ * *v--;
 476                 tmp += *f++ * *v--;
 477                 tmp += *f++ * *v--;
 478                 tmp += *f++ * *v--;
 479                 tmp += *f++ * *v--;
 480                 tmp += *f++ * *v--;
 481                 tmp += *f++ * *v--;
 482                 if((tmp += *f++ * *v) > 32767)
 483                     /* ceiling saturation */
 484                     **pcm = 0x7FFF;
 485                 else
 486                     if(tmp < -32768)
 487                         /* floor saturation */
 488                         **pcm = 0x8000;
 489                     else
 490                         **pcm = (s16)tmp;
 491                 *pcm += jump;
 492                 v += 15;
 493             }
 494             break;
 495         case 1:
 496             v = b->actual + 1;
 497             for(i=0; i<32; i++) {
 498                 tmp = *f++ * *v--;
 499                 tmp += *f++ * *v;
 500                 v += 15;
 501                 tmp += *f++ * *v--;
 502                 tmp += *f++ * *v--;
 503                 tmp += *f++ * *v--;
 504                 tmp += *f++ * *v--;
 505                 tmp += *f++ * *v--;
 506                 tmp += *f++ * *v--;
 507                 tmp += *f++ * *v--;
 508                 tmp += *f++ * *v--;
 509                 tmp += *f++ * *v--;
 510                 tmp += *f++ * *v--;
 511                 tmp += *f++ * *v--;
 512                 tmp += *f++ * *v--;
 513                 tmp += *f++ * *v--;
 514                 if((tmp += *f++ * *v) > 32767)
 515                     **pcm = 0x7FFF;
 516                 else
 517                     if(tmp < -32768)
 518                         **pcm = 0x8000;
 519                     else
 520                         **pcm = (s16)tmp;
 521                 *pcm += jump;
 522                 v += 15;
 523             }
 524             break;
 525         case 2:
 526             v = b->actual + 2;
 527             for(i=0; i<32; i++) {
 528                 tmp = *f++ * *v--;
 529                 tmp += *f++ * *v--;
 530                 tmp += *f++ * *v;
 531                 v += 15;
 532                 tmp += *f++ * *v--;
 533                 tmp += *f++ * *v--;
 534                 tmp += *f++ * *v--;
 535                 tmp += *f++ * *v--;
 536                 tmp += *f++ * *v--;
 537                 tmp += *f++ * *v--;
 538                 tmp += *f++ * *v--;
 539                 tmp += *f++ * *v--;
 540                 tmp += *f++ * *v--;
 541                 tmp += *f++ * *v--;
 542                 tmp += *f++ * *v--;
 543                 tmp += *f++ * *v--;
 544                 if((tmp += *f++ * *v) > 32767)
 545                     **pcm = 0x7FFF;
 546                 else
 547                     if(tmp < -32768)
 548                         **pcm = 0x8000;
 549                     else
 550                         **pcm = (s16)tmp;
 551                 *pcm += jump;
 552                 v += 15;
 553             }
 554             break;
 555         case 3:
 556             v = b->actual + 3;
 557             for(i=0; i<32; i++) {
 558                 tmp = *f++ * *v--;
 559                 tmp += *f++ * *v--;
 560                 tmp += *f++ * *v--;
 561                 tmp += *f++ * *v;
 562                 v += 15;
 563                 tmp += *f++ * *v--;
 564                 tmp += *f++ * *v--;
 565                 tmp += *f++ * *v--;
 566                 tmp += *f++ * *v--;
 567                 tmp += *f++ * *v--;
 568                 tmp += *f++ * *v--;
 569                 tmp += *f++ * *v--;
 570                 tmp += *f++ * *v--;
 571                 tmp += *f++ * *v--;
 572                 tmp += *f++ * *v--;
 573                 tmp += *f++ * *v--;
 574                 if((tmp += *f++ * *v) > 32767)
 575                     **pcm = 0x7FFF;
 576                 else
 577                     if(tmp < -32768)
 578                         **pcm = 0x8000;
 579                     else
 580                         **pcm = (s16)tmp;
 581                 *pcm += jump;
 582                 v += 15;
 583             }
 584             break;
 585         case 4:
 586             v = b->actual + 4;
 587             for(i=0; i<32; i++) {
 588                 tmp = *f++ * *v--;
 589                 tmp += *f++ * *v--;
 590                 tmp += *f++ * *v--;
 591                 tmp += *f++ * *v--;
 592                 tmp += *f++ * *v;
 593                 v += 15;
 594                 tmp += *f++ * *v--;
 595                 tmp += *f++ * *v--;
 596                 tmp += *f++ * *v--;
 597                 tmp += *f++ * *v--;
 598                 tmp += *f++ * *v--;
 599                 tmp += *f++ * *v--;
 600                 tmp += *f++ * *v--;
 601                 tmp += *f++ * *v--;
 602                 tmp += *f++ * *v--;
 603                 tmp += *f++ * *v--;
 604                 if((tmp += *f++ * *v) > 32767)
 605                     **pcm = 0x7FFF;
 606                 else
 607                     if(tmp < -32768)
 608                         **pcm = 0x8000;
 609                     else
 610                         **pcm = (s16)tmp;
 611                 *pcm += jump;
 612                 v += 15;
 613             }
 614             break;
 615         case 5:
 616             v = b->actual + 5;
 617             for(i=0; i<32; i++) {
 618                 tmp = *f++ * *v--;
 619                 tmp += *f++ * *v--;
 620                 tmp += *f++ * *v--;
 621                 tmp += *f++ * *v--;
 622                 tmp += *f++ * *v--;
 623                 tmp += *f++ * *v;
 624                 v += 15;
 625                 tmp += *f++ * *v--;
 626                 tmp += *f++ * *v--;
 627                 tmp += *f++ * *v--;
 628                 tmp += *f++ * *v--;
 629                 tmp += *f++ * *v--;
 630                 tmp += *f++ * *v--;
 631                 tmp += *f++ * *v--;
 632                 tmp += *f++ * *v--;
 633                 tmp += *f++ * *v--;
 634                 if((tmp += *f++ * *v) > 32767)
 635                     **pcm = 0x7FFF;
 636                 else
 637                     if(tmp < -32768)
 638                         **pcm = 0x8000;
 639                     else
 640                         **pcm = (s16)tmp;
 641                 *pcm += jump;
 642                 v += 15;
 643             }
 644             break;
 645         case 6:
 646             v = b->actual + 6;
 647             for(i=0; i<32; i++) {
 648                 tmp = *f++ * *v--;
 649                 tmp += *f++ * *v--;
 650                 tmp += *f++ * *v--;
 651                 tmp += *f++ * *v--;
 652                 tmp += *f++ * *v--;
 653                 tmp += *f++ * *v--;
 654                 tmp += *f++ * *v;
 655                 v += 15;
 656                 tmp += *f++ * *v--;
 657                 tmp += *f++ * *v--;
 658                 tmp += *f++ * *v--;
 659                 tmp += *f++ * *v--;
 660                 tmp += *f++ * *v--;
 661                 tmp += *f++ * *v--;
 662                 tmp += *f++ * *v--;
 663                 tmp += *f++ * *v--;
 664                 if((tmp += *f++ * *v) > 32767)
 665                     **pcm = 0x7FFF;
 666                 else
 667                     if(tmp < -32768)
 668                         **pcm = 0x8000;
 669                     else
 670                         **pcm = (s16)tmp;
 671                 *pcm += jump;
 672                 v += 15;
 673             }
 674             break;
 675         case 7:
 676             v = b->actual + 7;
 677             for(i=0; i<32; i++) {
 678                 tmp = *f++ * *v--;
 679                 tmp += *f++ * *v--;
 680                 tmp += *f++ * *v--;
 681                 tmp += *f++ * *v--;
 682                 tmp += *f++ * *v--;
 683                 tmp += *f++ * *v--;
 684                 tmp += *f++ * *v--;
 685                 tmp += *f++ * *v;
 686                 v += 15;
 687                 tmp += *f++ * *v--;
 688                 tmp += *f++ * *v--;
 689                 tmp += *f++ * *v--;
 690                 tmp += *f++ * *v--;
 691                 tmp += *f++ * *v--;
 692                 tmp += *f++ * *v--;
 693                 tmp += *f++ * *v--;
 694                 if((tmp += *f++ * *v) > 32767)
 695                     **pcm = 0x7FFF;
 696                 else
 697                     if(tmp < -32768)
 698                         **pcm = 0x8000;
 699                     else
 700                         **pcm = (s16)tmp;
 701                 *pcm += jump;
 702                 v += 15;
 703             }
 704             break;
 705         case 8:
 706             v = b->actual + 8;
 707             for(i=0; i<32; i++) {
 708                 tmp = *f++ * *v--;
 709                 tmp += *f++ * *v--;
 710                 tmp += *f++ * *v--;
 711                 tmp += *f++ * *v--;
 712                 tmp += *f++ * *v--;
 713                 tmp += *f++ * *v--;
 714                 tmp += *f++ * *v--;
 715                 tmp += *f++ * *v--;
 716                 tmp += *f++ * *v;
 717                 v += 15;
 718                 tmp += *f++ * *v--;
 719                 tmp += *f++ * *v--;
 720                 tmp += *f++ * *v--;
 721                 tmp += *f++ * *v--;
 722                 tmp += *f++ * *v--;
 723                 tmp += *f++ * *v--;
 724                 if((tmp += *f++ * *v) > 32767)
 725                     **pcm = 0x7FFF;
 726                 else
 727                     if(tmp < -32768)
 728                         **pcm = 0x8000;
 729                     else
 730                         **pcm = (s16)tmp;
 731                 *pcm += jump;
 732                 v += 15;
 733             }
 734             break;
 735         case 9:
 736             v = b->actual + 9;
 737             for(i=0; i<32; i++) {
 738                 tmp = *f++ * *v--;
 739                 tmp += *f++ * *v--;
 740                 tmp += *f++ * *v--;
 741                 tmp += *f++ * *v--;
 742                 tmp += *f++ * *v--;
 743                 tmp += *f++ * *v--;
 744                 tmp += *f++ * *v--;
 745                 tmp += *f++ * *v--;
 746                 tmp += *f++ * *v--;
 747                 tmp += *f++ * *v;
 748                 v += 15;
 749                 tmp += *f++ * *v--;
 750                 tmp += *f++ * *v--;
 751                 tmp += *f++ * *v--;
 752                 tmp += *f++ * *v--;
 753                 tmp += *f++ * *v--;
 754                 if((tmp += *f++ * *v) > 32767)
 755                     **pcm = 0x7FFF;
 756                 else
 757                     if(tmp < -32768)
 758                         **pcm = 0x8000;
 759                     else
 760                         **pcm = (s16)tmp;
 761                 *pcm += jump;
 762                 v += 15;
 763             }
 764             break;
 765         case 10:
 766             v = b->actual + 10;
 767             for(i=0; i<32; i++) {
 768                 tmp = *f++ * *v--;
 769                 tmp += *f++ * *v--;
 770                 tmp += *f++ * *v--;
 771                 tmp += *f++ * *v--;
 772                 tmp += *f++ * *v--;
 773                 tmp += *f++ * *v--;
 774                 tmp += *f++ * *v--;
 775                 tmp += *f++ * *v--;
 776                 tmp += *f++ * *v--;
 777                 tmp += *f++ * *v--;
 778                 tmp += *f++ * *v;
 779                 v += 15;
 780                 tmp += *f++ * *v--;
 781                 tmp += *f++ * *v--;
 782                 tmp += *f++ * *v--;
 783                 tmp += *f++ * *v--;
 784                 if((tmp += *f++ * *v) > 32767)
 785                     **pcm = 0x7FFF;
 786                 else
 787                     if(tmp < -32768)
 788                         **pcm = 0x8000;
 789                     else
 790                         **pcm = (s16)tmp;
 791                 *pcm += jump;
 792                 v += 15;
 793             }
 794             break;
 795         case 11:
 796             v = b->actual + 11;
 797             for(i=0; i<32; i++) {
 798                 tmp = *f++ * *v--;
 799                 tmp += *f++ * *v--;
 800                 tmp += *f++ * *v--;
 801                 tmp += *f++ * *v--;
 802                 tmp += *f++ * *v--;
 803                 tmp += *f++ * *v--;
 804                 tmp += *f++ * *v--;
 805                 tmp += *f++ * *v--;
 806                 tmp += *f++ * *v--;
 807                 tmp += *f++ * *v--;
 808                 tmp += *f++ * *v--;
 809                 tmp += *f++ * *v;
 810                 v += 15;
 811                 tmp += *f++ * *v--;
 812                 tmp += *f++ * *v--;
 813                 tmp += *f++ * *v--;
 814                 if((tmp += *f++ * *v) > 32767)
 815                     **pcm = 0x7FFF;
 816                 else
 817                     if(tmp < -32768)
 818                         **pcm = 0x8000;
 819                     else
 820                         **pcm = (s16)tmp;
 821                 *pcm += jump;
 822                 v += 15;
 823             }
 824             break;
 825         case 12:
 826             v = b->actual + 12;
 827             for(i=0; i<32; i++) {
 828                 tmp = *f++ * *v--;
 829                 tmp += *f++ * *v--;
 830                 tmp += *f++ * *v--;
 831                 tmp += *f++ * *v--;
 832                 tmp += *f++ * *v--;
 833                 tmp += *f++ * *v--;
 834                 tmp += *f++ * *v--;
 835                 tmp += *f++ * *v--;
 836                 tmp += *f++ * *v--;
 837                 tmp += *f++ * *v--;
 838                 tmp += *f++ * *v--;
 839                 tmp += *f++ * *v--;
 840                 tmp += *f++ * *v;
 841                 v += 15;
 842                 tmp += *f++ * *v--;
 843                 tmp += *f++ * *v--;
 844                 if((tmp += *f++ * *v) > 32767)
 845                     **pcm = 0x7FFF;
 846                 else
 847                     if(tmp < -32768)
 848                         **pcm = 0x8000;
 849                     else
 850                         **pcm = (s16)tmp;
 851                 *pcm += jump;
 852                 v += 15;
 853             }
 854             break;
 855         case 13:
 856             v = b->actual + 13;
 857             for(i=0; i<32; i++) {
 858                 tmp = *f++ * *v--;
 859                 tmp += *f++ * *v--;
 860                 tmp += *f++ * *v--;
 861                 tmp += *f++ * *v--;
 862                 tmp += *f++ * *v--;
 863                 tmp += *f++ * *v--;
 864                 tmp += *f++ * *v--;
 865                 tmp += *f++ * *v--;
 866                 tmp += *f++ * *v--;
 867                 tmp += *f++ * *v--;
 868                 tmp += *f++ * *v--;
 869                 tmp += *f++ * *v--;
 870                 tmp += *f++ * *v--;
 871                 tmp += *f++ * *v;
 872                 v += 15;
 873                 tmp += *f++ * *v--;
 874                 if((tmp += *f++ * *v) > 32767)
 875                     **pcm = 0x7FFF;
 876                 else
 877                     if(tmp < -32768)
 878                         **pcm = 0x8000;
 879                     else
 880                         **pcm = (s16)tmp;
 881                 *pcm += jump;
 882                 v += 15;
 883             }
 884             break;
 885         case 14:
 886             v = b->actual + 14;
 887             for(i=0; i<32; i++) {
 888                 tmp = *f++ * *v--;
 889                 tmp += *f++ * *v--;
 890                 tmp += *f++ * *v--;
 891                 tmp += *f++ * *v--;
 892                 tmp += *f++ * *v--;
 893                 tmp += *f++ * *v--;
 894                 tmp += *f++ * *v--;
 895                 tmp += *f++ * *v--;
 896                 tmp += *f++ * *v--;
 897                 tmp += *f++ * *v--;
 898                 tmp += *f++ * *v--;
 899                 tmp += *f++ * *v--;
 900                 tmp += *f++ * *v--;
 901                 tmp += *f++ * *v--;
 902                 tmp += *f++ * *v;
 903                 v += 15;
 904                 if((tmp += *f++ * *v) > 32767)
 905                     **pcm = 0x7FFF;
 906                 else
 907                     if(tmp < -32768)
 908                         **pcm = 0x8000;
 909                     else
 910                         **pcm = (s16)tmp;
 911                 *pcm += jump;
 912                 v += 15;
 913             }
 914             break;
 915         case 15:
 916             v = b->actual + 15;
 917             for(i=0; i<32; i++) {
 918                 tmp = *f++ * *v--;
 919                 tmp += *f++ * *v--;
 920                 tmp += *f++ * *v--;
 921                 tmp += *f++ * *v--;
 922                 tmp += *f++ * *v--;
 923                 tmp += *f++ * *v--;
 924                 tmp += *f++ * *v--;
 925                 tmp += *f++ * *v--;
 926                 tmp += *f++ * *v--;
 927                 tmp += *f++ * *v--;
 928                 tmp += *f++ * *v--;
 929                 tmp += *f++ * *v--;
 930                 tmp += *f++ * *v--;
 931                 tmp += *f++ * *v--;
 932                 tmp += *f++ * *v--;
 933                 if((tmp += *f++ * *v) > 32767)
 934                     **pcm = 0x7FFF;
 935                 else
 936                     if(tmp < -32768)
 937                         **pcm = 0x8000;
 938                     else
 939                         **pcm = (s16)tmp;
 940                 *pcm += jump;
 941                 v += 31;
 942             }
 943             break;
 944     }
 945
 946     /* Set the next position in the filter bank */
 947     b->pos++;
 948     b->pos &= 15;
 949     b->actual = (b->actual == b->v1 ? b->v2 : b->v1);
 950 }